Zusha Elinson of the Wall Street Journal takes us on a strange trip through the world of Smart Car enthusiasts who love to soup up their tiny rides, including one guy who put a train horn on his:

Jeremy Cox, 26, who parked next to Mr. Redmond at Cars and Coffee, says that his friends call his bright green Smart car convertible a "pregnant roller skate." So Mr. Cox, who has spent about $20,000 modifying his car, exacted a small measure of revenge by installing a 195-decibel train horn.

"You don't expect it coming out of Smart car," says Mr. Cox, who proceeded to unleash a powerful blast, causing a nearby cluster of car enthusiasts to jump. "I don't really have any response when people say stuff—but I do have the horn."